Mother of Pearl (Nacre)
Aragonite (CaCO3) with Organic Matrix
mineral
Category
Synthetic Polymer (Polylactic Acid)
Browse synthetic polymer (polylactic acid) specimens identified by the Rock Identifier community.
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Amber
Succinite (fossilized resin); C10H16O
mineraloid
Amber
Succinicum (C10H16O)
mineral
Red Amber (Burmite/Cherry Amber)
Succinite / Retinite (Organic Fossilized Resin, C10H16O)
Mineraloid (Organic)
Amber
Succinite (with empirical formula approximately C10H16O)
Organic Mineraloid
Amber
Fossilized plant resin; primarily organic terpenoid compounds (not a mineral)
gemstone
Amber
Succinite (C10H16O)
gemstone
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Corundum (variety Ruby/Sapphire)
Aluminum Oxide (Al2O3)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst cabochon
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
gemstone
Likely citrine or yellow glass imitation in a silver-tone bracelet
Citrine: quartz, SiO₂; exact material cannot be confirmed visually
gemstone
Blue Goldstone
Aventurine Glass
man-made glass
Opalite
Man-made opalescent glass (SiO2 + metal oxides)
mineral (synthetic)
Green cabochon gemstone pendant, likely turquoise or dyed green turquoise
Probably turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact identification requires testing
gemstone
Lapis Lazuli
Lapis lazuli (complex rock; primarily Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Emerald
Beryl (Be3Al2(SiO3)6) with trace Chromium/Vanadium
mineral
Pearls (likely freshwater cultured pearls)
Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin
gemstone
Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
mineral
Tumbled amber (likely)
Amber—fossilized plant resin, commonly succinite (C₁₀H₁₆O)
gemstone
Polished amber
Amber (fossilized plant resin; chiefly polymerized diterpenoid resin)
gemstone
Amber
Succinite (organic gemstone, approx. C10H16O)
fossil
Amber
Succiniferous organic material (Succinite)
fossil
Amber
Fossilized tree resin
gemstone
Amber
Succinite (Carbon-based organic compound; approximate formula C10H16O)
Mineraloid
Amber
Succinite (formula varies, primarily C10H16O)
Mineraloid (Organic)
Amber
Succinite (fossilized resin)
Organic Mineraloid
Amber
Fossilized Tree Resin (C10H16O)
mineral
Amber (Copal)
Succinate (Fossilized Tree Resin)
mineraloid
Amber with inclusion
Amber (Fossilized Tree Resin)
mineral
Amber
Succinite (specifically for Baltic Amber), Formula: C10H16O
Organic Gemstone (often associated with Sedimentary sequences)
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite (Carbon ≥ 86%)
sedimentary
Yellow Sapphire
Corundum (Al2O3:Fe)
gemstone
Citrine
Citrine (Silicon Dioxide, SiO2)
mineral
Iolite (Cordierite)
Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18
Mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Blue Sapphire
Corundum (Al2O3 with trace Titanium and Iron)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz (with Druzy/Polished Edge)
Smoky Quartz (Silicon Dioxide, SiO2)
mineral